Lumens to Watts Calculator
Convert lumens to watts for LED, incandescent, halogen, and CFL bulbs. Understand lighting efficiency and calculate energy savings when switching bulb types.
Step 1: Brightness Input
Understanding Lumens
Lumens measure the total amount of visible light emitted by a source. Higher lumens mean brighter light. Modern LED bulbs produce more lumens per watt than traditional incandescent bulbs.
Step 2: Bulb Type & Efficiency
About Bulb Efficacy
Efficacy measures how efficiently a bulb converts electricity to light (lumens per watt). LED bulbs typically have 80-120 lm/W, while incandescent bulbs only have 10-17 lm/W.
Conversion Results
Equivalent Wattage
Bulb Type Comparison
| Bulb Type | Typical Efficacy | Wattage Needed | Annual Cost* | Lifespan |
|---|
*Based on 4 hours daily usage at $0.15/kWh
Energy Consumption Analysis
Lumens to Watts Formula
Watts = Lumens ÷ Efficacy (lm/W)
The wattage needed is calculated by dividing the desired brightness in lumens by the bulb’s efficacy (lumens per watt). Higher efficacy means less wattage is needed for the same brightness.
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